Messages in this thread |  | | Date | Wed, 13 Nov 2013 12:24:35 -0800 | From | Guenter Roeck <> | Subject | Re: [PATCH] gcc4: Disable __compiletime_object_size for GCC 4.6+ |
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On Wed, Nov 13, 2013 at 10:39:13AM -0800, Kees Cook wrote: > Hi Guenter, > > On Fri, Apr 12, 2013 at 07:49:08PM -0700, Guenter Roeck wrote: > > __builtin_object_size is known to be broken on gcc 4.6+. > > See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48880 for details. > > > > This causes unnecssary build warnings and errors such as > > > > In function 'copy_from_user', inlined from 'sb16_copy_from_user' > > at sound/oss/sb_audio.c:878:22: > > arch/x86/include/asm/uaccess_32.h:211:26: error: call to 'copy_from_user_overflow' > > declared with attribute error: copy_from_user() buffer size is not provably correct > > make[3]: [sound/oss/sb_audio.o] Error 1 (ignored) > > > > Disable it where broken. > > Is there an alternative? This means that things like > DEBUG_STRICT_USER_COPY_CHECKS are being rendered useless. I don't think > this is _always_ broken, just under certain situations, right? > There was a recent proposal to address the problem differently and then revert this patch. Not sure what happened with it. I can try digging it up if necessary.
Guenter
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